Darth Plagueis versus Yoda
Is Darth Plagueis powerful enough to defeat Yoda in single combat?
While he accepted that he and Plagueis were more than equal to the most powerful of the Jedi Order, he understood that they were no match for their combined strength—the Sith imperative notwithstanding.
Taken from Star Wars: Darth Plagueis
The above is perception of Palpatine but make of it what you want.